body{
    border : 1px solid blue ;
    margin: 0px;
    /*background-color: aquamarine;*/
}

table {
    border: 1px solid cadetblue;
    border-collapse: collapse;
    width: 400px;
    margin: 50px auto;
}

table td {
    text-align: center;
    height: 45px;
}

table tr:nth-child(even) {
    background-color: beige;
}

table tr:first-child {
    background-color: darkcyan;
    color: white;
}

form input[type="submit"]{
    border: 1px solid blue;
    background-color: white;
    width: 150px;
    height: 35px;
}

form input[type="text"] , form input[type="password"]{
    border: 1px solid blue;
    width: 240px;
    height: 30px;
    font-size: 16px;
}

form table td{
    background-color: white;
    color: black;
}